Brake shield



Feb. 25, c E U BRAKE SHIELD Filed Nov. 21. 1934 Mai-l III-III II wIIIII"INVENTOR. Clem/155E911 ATTORNEY.

Patented Feb. 25, 1936 BRAKE SHIELD Clarence E. Budd, South Bend, Ind.,asslgnor to Bendix Products Corporation, South Bend, Ind., a corporationof Indiana Application November 21, 1934, Serial No. 754,024

2 Claims.

This invention relates to brakes, and is illustrated as embodied in aninternal expanding brake having a novel and improved joint between thedrum and the backing plate.

5 An object of the invention is to provide simple and inexpensive, buteffective, means for sealing the joint between the drum and backingplate, to keep out dirt, water, etc. Preferably the seal is made veryefiective by a double seal, or a sort of multiple baflie.

In the preferred arrangement, a sheet met device is formed with adouble-thickness inner portion welded or otherwise secured to theperipheral portion of the backing plate, and with di- 15 verging outerportions cooperating respectively with the inner and outer surfaces ofthe drum.

Preferably the portion which cooperates with the exterior of the drumhas a flange encircling the drum adjacent its free edge.

This'novel sheet-metal device may be made by forming or rolling-stripstock to the desired crosssection, in a continuous spiral if it isrolled. If such a spiral is formed, sections are cut therefrom and theirends welded or otherwise secured to- 25 gether to form substantiallycomplete rings. The

device may also be built up by making two stampings and welding orotherwise securing them together at the double-thickness portion.

The above and other objects and features of 30 the invention, includingvarious novel combinations of parts and desirable particularconstructions, will be apparent from the following description of theillustrative constructions shown in the accompanying drawing, in which:

Figure 1 is a section through a brake embodying the invention;

Figure 2 is a perspective view of a blank which may be used;

Figures 3 and 4 are sections showing the form- 40 ing of the device fromthe blank of Figure 2;

Figure 5 is a perspective showing a piece of strip stock suitable foruse in making the device by a rolling operation;

Figure 6 shows this stock rolled to the neces- 45 sary cross-section, ina long continuous spiral;

Figure 7 is an elevation showing a ring made from a section of thespiral of Figure 6, with its ends welded together; and

Figure 8 is a partial section through a brake,

50 corresponding to the upper part of Figure 1, but showing the devicemade by welding together two stampings.

The illustrated brake includes a rotatable drum l0 having a cylindricalbraking flange l2, prefer- 66 ably with an external stiffening flange Hat its edge. A backing plate It, arranged at the open side of the drum,cooperates with the drum to form a substantially closed brake chamberhousing the brake friction means, shown as shoes l8. The presentinvention has to do with sealing 5 the joint between the drum and thebacking plate.

In the method of making the sealing device illustrated in Figures 2, 3and 4, I provide a ring 20 of sheet metal, either stamped from a flat 1osheet, or bent edgewise from a steel strip. In the latter case the endsof the bent section of sheet steel are butt-welded or otherwise securedtogather to form a continuous flat ring.

This blank is first drawn into the shape shown in Figure 3, with acylindrical inner flange 22, and a channel-section portion 24terminating in a peripheral cylindrical flange 26. The flange is nextformed radially outward as a plane portion 28. This gives two divergingportions 24 and. 28 integrally connected by a double-thickness portionMB.

The device is next secured to the periphery of the backing plate it, asshown in Figure 1, for example by welding the double-thickness portion25 to the outer peripheral zone of the backing plate. When the backingplate and the drum are then assembled as in Figure 1, the portion 28 isin close sealing proximity to the interior of the brake drum, beingclosely encircled by the 30 braking flange l2, while the flange 28closely encircles the drum flange Hi in cooperative sealing relationshipthereto. This gives the desired double baiile efiect, and effectivelyseals the joint.

As illustrated in Figures 5, 6 and 7, the device may be made from stripsteel 32 (Figure 5), by rolling it into a spiral 38 of the cross-sectionshown in Figure 4, cutting a convolution thereirom and flattening itinto a ring 36 (Figure 7) and butt-welding or otherwise securing itsends together in a permanent joint 38.

As illustrated in Figure 8, two ring-shaped blanks similar to the blank20 may be provided, one being somewhat larger and being stamped orpressed to form the channel 24 and the flange 26, and the innerperipheral zones of the two blanks being welded or otherwise securedtogether to form a. double-thickness portion 40 corresponding to theportion 30 shown in Figures 1 and 4.

While several illustrative constructions have been described in detail,it is not my intention to limit the scope of the invention to thoseparticular constructions, or otherwise than by the terms of the appendedclaims.

I claim:

LAbrake baekineplatcadaptedtobearrangedatandtocloeetheopensideoiahrakedrum.andhnvingaecuredatitsperiphery a sheet metal member doubled onitself and having one edge in close proximity to the internal surface oithe drum and having a portion adjacent its other edge projecting overthe exterior o! the drum prising a double-thickness inner portion formedto be secured to the backing plate and two diverging outer annularportions, one adapted to come into close proximity to the interior of abrake drum and the other having a peripheral flange adapted to encirclethe periphery of the drum at its edge, said device comprising asheet-metal Dart folded on itself to form said double-thickness portion.

